Heat and smoke generator.



F. ST'APP.

HEAT AND SMOKE GENERATOR.

APPLIGATION FILED AUG. 17, 190B.

Patented Mar. 16, 1909.

2 SHEETS-SHEET 1.

7 p. 3 l minus fa UNITED STATiZs @FFICE.

FREDERICK STAPP, OF DENVER, COLORADO.

HEAT AND SMOKE GENERATOR.

Specification of Letters Patent.

Patented March 16, 1909.

To all whom it may concern:

Be it known that I, FREDERICK STAPP, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Heat and Smoke Generators and I do declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in f the art to which it appertains to make and use the same, reference being bad to the ao companying drawings, and to theiigures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in heating devices my object being to provide relatively small fuel receptacles, adapted to be distributed in orchards and gardens or in such localities in horticultural districts having orchards, gardens or vegetation of any kind that is liable to be injured by frost.

My further object is to provide a device which shall be exceedingly simple in construction, economical in cost, reliable, durable and efficient in use.

It is very important that a construction of this class shall be supplied at small cost since a great many of them are required in order to roduce the desired effect. In other worc s, these relatively small heaters are placed at such intervals as will serve to raise the temperature of the air in the entire district to be protected, to a suificient degree to prevent injury by frost or an undue fall in the temperature.

My device is preferably formed of two pieces of sheet metal which in blank form have their upper and lower edges parallel, while their opposite side edges are inclined toward each other from the upper to the lower edges of the plates, these edges preferably being equally inclined and therefore forming equal angles with the top and bottom edges of the plate. These two metal sheets or plates, are bent and connect-ed to form a fuel inclosure open at both ends. In form ing this inclosure or receptacle the two shorter sides of the plates are lowermost and when the adjacent edges of the sheets are connected, a receptacle is formed which is largest at the top and smallest at the bottom, being frusto-conical or approximately frustoconical in shape. The peculiar feature of this construction, however, lies in the fact that both the top and bottom edges are curved whereby when the device rests upon f a plane surface, as the ground, it touches the l latter, if perfectly level, at two points only, from which points the edge is upwardly curved forming spaces on opposite sides of g the receptacle for the entrance of air for purposes of combustion. When in use a quantity of fuel, as coal, is placed within the re- 1 ceptacle or inclosure and ignited. The fuel resting upon the ground and engaging the inner sides of the device, retains the latter in a stable position, thus preventing accidental l disturbance.

Having briefly outlined my improved con- 5 struction, I will proceed to describe the l same in detail, reference being made to the accompanying drawing in which is illus l trated an embodiment thereof. In this drawing, Figure 1 is a view illustrating a piece of sheet metal adapted to form I one of my improved receptacles. The line upon which the sheet is separated is indicated, also the turned edges to form the seams of the receptacle, are indicated by dotted lines. This view indicates that the memhere which constitute the receptacle, may be out without waste of material. Fig. shows the two sheet metal members bent into proper shape to form the receptacle, their edges being turned to form the seams. In this view the edges of the two members are not joined. Fig. 3 is a side elevation of the complete receptacle. Fig. 4 is a similar view looking at right angles to Fig. 3, and shown on a larger scale. Fig. 5 is a section taken through the device on the line 55 Fig. 4.. Fig. 6 is a section taken at right angles to Fig. 5 showing a quantity of fuel in place within the receptacle.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate each of two pieces of sheet metal whose upper and lower 1 to form a frusto-conical device, their upper and lower edges are still parallel but are curved so that when the two members are connected to form the device 6, the top and bottom edges of each member are curved downwardly from the opposite ends of the two edges, whereby the bottom of the device,

which is smallest in diameter, when placed justed to partly uncover the top of the reupon a plane surface, touches the latter at ceptacle. hen in full operation, however, two opposite edges only, leaving two spaces for heat generating purposes, the cover will 9 on opposite sides of the points of contact, I not be needed. If, however, it is desired to the upper outline of each space being curved i produce smoke, the device should be at least both vertically and transversely, leaving air I partly closed at the top. spaces between the ground or other plane sur Having thus described my invention what face and the lower edge of the receptacle. I claim is: It will be understood that the upper edge of 1. A device of the class described, comthe receptacle is correspondingly shaped. posed of a plurality of sheet metal members, each member having its top and bottom Hence, upon the top of the receptacle, a

downwardly curved plate 10 may be placed, edges parallel, the upper edge being longer forming a cover for closing the receptacle than the lower edge, the two members being curved and having their sides connected, the

whenever it shall be necessary to do so. By I reason of the peculiar shape of the top of the arrangement being such that the two shorter sides of the members, are at-the one extremreceptacle, this plate will be retained in posiity of the device and the two longer sides at tion against lateral displacement.

In forming the device, the two flat sheets 5 the opposite extremity, substantially as described.

are first bent at their opposite edges to form 2. A device of the class described, comthe interlocking hooks 7 and 8; the sheets are then correspondingly curved by passing prising an open ended receptacle having its extremities ol diiferent diameters and so them through suitable rolls. Their edges are then interlocked and pressed tightly shaped that when either end of the device is whereby the two members are securely conplaced upon a flat surface, it shall be tannected to form the fuel receptacle. It will gential thereto at two opposite points.

thus be observed that the device is construct- 3. A device of the class described formed of two pieces of sheet metal having two oped Without the use of solder or other mateposite edges parallel and their opposite side rial that will be melted by the heat. When the device is completed. and placed upon the edges inclined, the two plates being bent and having their side edges connected to form a ground or other level surface, it is tangential receptacle whose greatest diameter 18 at the thereto at two opposite points, leaving air spaces between the bottom walls of the detop and smallest diameter is at the bottom,

for the purpose set forth.

vice and the ground or other plane surface.

l. A device of the class described having The device is then ready for use and a quantity of coal 12 or other suitable fuel, may be the general shape of the frustum of a cone, but whose opposite extremities are tangenplaced within the walls of the device and resting upon the ground or other plane surtial to a flat surface at two opposite points,

substantially as described.

face. When this coal is ignited, combus- 5. A device of the class described formed tion is maintained for the desired purposev by the entrance of air at the bottom of the of two substantially twin plates of sheet metal, whose upper and lower edges are of device. When in use these devices will be placed at suitable intervals within the -field equal length, the two plates being curved to form a device approximately frusto-conical' or orchard to maintain the temperature of the air above the freezing or host point. It in shape, its opposite extremities being of unequal diameters, substantially as dewill ordinarily be necessary to prepare these devices in advance of the time when they will scribed.

be used, namely, during the night. It will, In testimony whereof I affix my signature therefore, usually be advantageous to proin presence of two witnesses.

FREDERICK STAPP.

tect the fuel by useof the top plate or cover 10, which, however, when the fuel is burning, should not ordinarily be employed unless it is desired to retard combustion. If this should be necessary, the'plate may be ad- VVitnesses A. J. OBRIEN, LOUISE COSNER. 

